There are age limits to over 65 world first travel insurance and disclaimers that you know you are in good health before you travel. Many policies cease at the age of 65 some at 70 some at 75, but you have to look for special insurance if you over the age of 80. There is normally a premium to pay as you move over 65.
You are just as likely to have an accident or become ill on a foreign business trip as a foreign holiday. However many take business trips alone and do have the support of a family around them should they become ill. At least with over 65 world first travel insurance you will have help at the end of the phone and be covered financially for medical treatment.
Most annual policies only allow you to travel for a certain amount of days per trip, normally 30 days. If you intend to travel for a longer period, even if it is well within your policy dates, you should buy a policy that allows extended travel periods. This may cost a bit more.
Even the smallest of ailments could prevent you from flying home, like an ear infection. Not having over 65 world first travel insurance would mean finding money to pay for return flights, and accommodation during your extended stay.